/* eslint-disable */
// 修改https://github.com/PanJiaChen/vue-element-admin/blob/master/src/vendor/Export2Excel.js文件改成多sheet模式导出excel
import { saveAs } from 'file-saver';
import XLSX from 'xlsx';

function generateArray(table) {
  var out = [];
  var rows = table.querySelectorAll('tr');
  var ranges = [];
  for (var R = 0; R < rows.length; ++R) {
    var outRow = [];
    var row = rows[R];
    var columns = row.querySelectorAll('td');
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C];
      var colspan = cell.getAttribute('colspan');
      var rowspan = cell.getAttribute('rowspan');
      var cellValue = cell.innerText;
      if (cellValue !== '' && cellValue == +cellValue) cellValue = +cellValue;

      //Skip ranges
      ranges.forEach(function(range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
        }
      });

      //Handle Row Span
      if (rowspan || colspan) {
        // rowspan = rowspan || 1;
        // colspan = colspan || 1;
        rowspan = Number(rowspan || 1);
        colspan = Number(colspan || 1);
        ranges.push({
          s: {
            r: R,
            c: outRow.length,
          },
          e: {
            r: R + rowspan - 1,
            c: outRow.length + colspan - 1,
          },
        });
      }

      //Handle Value
      outRow.push(cellValue !== '' ? cellValue : null);

      //Handle Colspan
      if (colspan) for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
}

function datenum(v, date1904) {
  if (date1904) v += 1462;
  var epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {
    s: {
      c: 10000000,
      r: 10000000,
    },
    e: {
      c: 0,
      r: 0,
    },
  };
  for (var R = 0; R != data.length; ++R) {
    for (var C = 0; C != data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R;
      if (range.s.c > C) range.s.c = C;
      if (range.e.r < R) range.e.r = R;
      if (range.e.c < C) range.e.c = C;
      var cell = {
        v: data[R][C],
      };
      if (cell.v == null) continue;
      var cell_ref = XLSX.utils.encode_cell({
        c: C,
        r: R,
      });

      if (typeof cell.v === 'number') cell.t = 'n';
      else if (typeof cell.v === 'boolean') cell.t = 'b';
      else if (cell.v instanceof Date) {
        cell.t = 'n';
        cell.z = XLSX.SSF._table[14];
        cell.v = datenum(cell.v);
      } else cell.t = 's';

      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
  return ws;
}

function Workbook() {
  if (!(this instanceof Workbook)) return new Workbook();
  this.SheetNames = [];
  this.Sheets = {};
}

function s2ab(s) {
  var buf = new ArrayBuffer(s.length);
  var view = new Uint8Array(buf);
  for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xff;
  return buf;
}

export function export_table_to_excel(ref, filename, sheetname) {
  var wb = new Workbook();
  ref.forEach((el,i) => {
    // var theTable = document.getElementById(el);
    var oo = generateArray(el);
    var ranges = oo[1];

    /* original data */
    var data = oo[0];
    var ws_name = sheetname[i];
    let ws = sheet_from_array_of_arrays(data);
    /* add ranges to worksheet */
    // ws['!cols'] = ['apple', 'banan'];
    ws['!merges'] = ranges;
    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;
  });

  var wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary',
  });

  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream',
    }),
    `${filename}.xlsx`,
  );
}

// export function export_json_to_excel({
//   multiHeader = [],
//   header,
//   data,
//   filename,
//   merges = [],
//   autoWidth = true,
//   bookType = 'xlsx'
// } = {}) {
//   /* original data */
//   filename = filename || 'excel-list'
//   data = [...data]
//   data.unshift(header);

//   for (let i = multiHeader.length - 1; i > -1; i--) {
//     data.unshift(multiHeader[i])
//   }

//   var ws_name = "SheetJS";
//   var wb = new Workbook(),
//     ws = sheet_from_array_of_arrays(data);

//   if (merges.length > 0) {
//     if (!ws['!merges']) ws['!merges'] = [];
//     merges.forEach(item => {
//       ws['!merges'].push(XLSX.utils.decode_range(item))
//     })
//   }

//   if (autoWidth) {
//     /*设置worksheet每列的最大宽度*/
//     const colWidth = data.map(row => row.map(val => {
//       /*先判断是否为null/undefined*/
//       if (val == null) {
//         return {
//           'wch': 10
//         };
//       }
//       /*再判断是否为中文*/
//       else if (val.toString().charCodeAt(0) > 255) {
//         return {
//           'wch': val.toString().length * 2
//         };
//       } else {
//         return {
//           'wch': val.toString().length
//         };
//       }
//     }))
//     /*以第一行为初始值*/
//     let result = colWidth[0];
//     for (let i = 1; i < colWidth.length; i++) {
//       for (let j = 0; j < colWidth[i].length; j++) {
//         if (result[j]['wch'] < colWidth[i][j]['wch']) {
//           result[j]['wch'] = colWidth[i][j]['wch'];
//         }
//       }
//     }
//     ws['!cols'] = result;
//   }

//   /* add worksheet to workbook */
//   wb.SheetNames.push(ws_name);
//   wb.Sheets[ws_name] = ws;

//   var wbout = XLSX.write(wb, {
//     bookType: bookType,
//     bookSST: false,
//     type: 'binary'
//   });
//   saveAs(new Blob([s2ab(wbout)], {
//     type: "application/octet-stream"
//   }), `${filename}.${bookType}`);
// }

export function export_json_to_excel(json = {}) {
  const bookType = json.bookType;
  const filename = json.filename || 'excel-list';
  const sheetFile = json.sheetFile;
  if (sheetFile.length === 0) {
    return;
  }
  let wb = new Workbook();
  sheetFile.forEach(item => {
    /* original data */
    // filename = item.filename || 'excel-list';
    item.data = [...item.data];
    item.data.unshift(item.header);

    for (let i = item.multiHeader.length - 1; i > -1; i--) {
      item.data.unshift(item.multiHeader[i]);
    }

    var ws_name = item.sheetName || 'sheet';
    let ws = null;
    ws = sheet_from_array_of_arrays(item.data);

    if (item.merges.length > 0) {
      if (!ws['!merges']) ws['!item.merges'] = [];
      item.merges.forEach(el => {
        ws['!item.merges'].push(XLSX.utils.decode_range(el));
      });
    }

    if (item.autoWidth) {
      /*设置worksheet每列的最大宽度*/
      const colWidth = item.data.map(row =>
        row.map(val => {
          /*先判断是否为null/undefined*/
          if (val == null) {
            return {
              wch: 10,
            };
          } else if (val.toString().charCodeAt(0) > 255) {
            /*再判断是否为中文*/
            return {
              wch: val.toString().length * 2,
            };
          } else {
            return {
              wch: val.toString().length,
            };
          }
        }),
      );
      /*以第一行为初始值*/
      let result = colWidth[1];
      for (let i = 1; i < colWidth.length; i++) {
        for (let j = 0; j < colWidth[i].length; j++) {
          if (result[j]['wch'] < colWidth[i][j]['wch']) {
            result[j]['wch'] = colWidth[i][j]['wch'];
          }
        }
      }
      ws['!cols'] = result;
    }
    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;
  });

  var wbout = XLSX.write(wb, {
    bookType: bookType || 'xlsx',
    bookSST: false,
    type: 'binary',
  });
  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream',
    }),
    `${filename}.${bookType}`,
  );
}
